The reality dating show's two-part final starts tonight with Garvey whisking the three final bachelorettes - Frost, Lisa Hyde and Louise Pillidge - off to South Africa.

Based on promotional footage it looks like Frost will get up close to some great white sharks with Garvey, while Hyde will visit some local children at a Capetown school and Pillidge will go on safari.

SportsBet has 25-year-old Frost as the woman to beat at $1.70 odds, while Hyde is the runner-up at $2.50 odds.